fJHEOPLASTIC METHOD OF MOUNTING TEETH. 129 



intruding on the tongue, as it seldom became loose 

 at all, the tartar actually cementing it to the teeth. 



Dr. Blandy, of New York, then read a paper " On the Cheoplastic 

 Method of Mounting Artificial Teeth" — 



The necessity for a more accurately fitting 

 denture than has been used is one that has always 

 existed, and perhaps ever will exist, until a pro- 

 cess shall be made known by which the principle 

 of atmospheric pressure shall be perfectly applied 

 in the retention of artificial teeth in the mouth. 



This principle gives a power of fifteen pounds 

 to the square inch; and it follows that the pro- 

 cess which best accommodates all its require- 

 ments, is the one which should be adopted in the 

 construction of all pieces for the mouth, being 

 equally desirable in pieces of greater or lesser size, 

 with clasps and springs, or without either, the 

 former being required in proportion as the means 

 used enables the manipulator to bring to bear 

 this principle of atmospheric pressure. 



A plate that is struck between two dies is, of 

 necessity, a rude fit to the mouth at best; as, 

 admitting that the impression has been correct, 

 and the casts from this impression carefully taken, 

 you encounter the change invariably following 

 from the shrinkage of these dies, as well as the 

 perhaps minute differences resulting from even the 

 most correct manipulation : added to these, is the 

 change of surface of dies from pressure used in 



